On self-build projects you do not pay VAT on the construction costs but you will always pay VAT on consultants fees.
You can apply for a VAT refund on building materials and services if you’re:
The building work and materials have to qualify and you must apply to HM Revenue and Customs (HMRC) within 3 months of completing the work.
VAT is applicable to all consultants.
If you carry out work to an existing building you will normally have to pay VAT at the standard rate. You may be able to pay VAT at the reduced rate of 5% if you’re renovating or altering either: